Year	current US$
1960	180000000
1961	143000000
1962	172000000
1963	174000000
1964	179000000
1965	126000000
1966	137000000
1967	156000000
1968	183000000
1969	184000000
1970	249000000
1971	243000000
1972	348000000
1973	442000000
1974	637000000
1975	894000000
1976	716000000
1977	780000000
1978	676000000
1979	869000000
1980	1217000000
1981	1457000000
1982	984000000
1983	1083000000
1984	1254000000
1985	1228000000
1986	1312000000
1987	1498000000
1988	1963000000
1989	2241000000
1990	2170000000
1991	2449000000
1992	2831000000
1993	3211000000
1994	3453000000
1995	3780000000
1996	4053000000
1997	4614000000
1998	4989000000
1999	5137000000
2000	5737000000
2001	5276000000
2002	5165000000
2003	5471000000
2004	5936000000
2005	6145000000
2006	6610000000
2007	7160000000
2008	6748000000
2009	5483000000
2010	6754000000
2011	8492000000
2012	9069000000
2013	9651000000
2014	9899000000
2015	9442000000
2016	9840000000
2017	10135000000
2018	10638000000
2019	11193000000
2020	10302000000
2021	12487000000
2022	13777000000
2023	12935000000